Company Confidential
22
Raveon Technologies Corp.
incomplete.
The maximum length for a standard alpha-numeric message is 40 characters.
7.5. WMX and POCSAG Decoding
The WMX protocol may be enabled with the modem in the POCSAG mode. This
allows the user to easily read the ID that was decoded by the POCSAG receiver.
Details about WMX and code examples are on the Raveon website at
When a POCSAG message is received, and the WMX feature is enabled in the
unit (
WMX 1
command), then the M8S will output the decoded message wrapped
in the WMX frame format as shown below.
WMX Frame Format
WMX Frames are used to pass data into and out of a radio modem. The bytes in
the data field of the frame, field 6, contains the data that is transferred.
WMX Data Frame Format for Paging Reception
Field
Number
Bytes
Field Name
ASCII
Code
Function
1
Start of Header (SOH)
1 (0x01)
Indicates beginning of a frame
1
1
Control Field
*1
0x42
Indicates a Receive Data WMX message
2
0-6
Destination Address
ID in ASCII
hex, 0000-
FFFFFF
6 ASCII HEX representation of the decoded CAP code. For
example, cap code 279001 will be represented in the field as
441D9.
1
Separator 1 (
!
)
33 (0x21)
Field separator character 1.
3
0-4
Source Address
(Optional when
transmitting)
Null (no byte)
This field is unused in POCSAG Decoder. It may contain the ID of
the radio that sent this WMX message.
1
Separator 3 (
#
)
35 (0x23)
Field separator character 3
(when transmitting, may be left out if sequence field is not used)
5
0-4
Sequence
ASCII number
0-255
A sequence number for this reception to uniquely identify it.
Increments every reception.
1
Separator 4 (
$
)
36 (0x24)
Field separator character 4
